Get energized or wind down naturally with the Feit Electric A800/HLTH/LEDI circadian rhythm light bulb. This innovative dual-mode Circadian LED light bulb offers the ability to control and personalize the lighting spectrum to deliver daytime productivity and natural sleep enhancement in one light. Easily transition through light modes by turning the bulb on and off with a standard wall switch. Change the light according to the sun's natural progression to support your body's natural circadian rhythm. It's rated to last up to 15,000 hours, for fewer bulb replacements over the life of the bulb. Choose an energy-saving bulb that works with your natural body rhythms to help you power through the daytime and sleep better at night.